阅读说明：本技术 燃料泵的公差和磨损补偿 (Tolerance and wear compensation for fuel pumps ) 是由 S·克伦伯格 M·阿卜杜勒马里克 M·沃尔克 A·索斯纳 于 2018-11-01 设计创作，主要内容包括：提出了一种用于确定参数曲线i、n的拐点OP的方法,该拐点表示燃料泵的部件公差和磨损状态,其中,燃料泵12被设置成用于燃料供应系统2,该燃料供应系统用于在配备有内燃发动机的装置中使用。在此,装置可以是乘用车、多用途交通工具、和/或静止式或移动式发电机。此外,提出了用于执行该方法的计算机程序和计算机程序产品,其中,藉由软件对该方法分别进行建模。(A method is proposed for determining an inflection point OP of a parameter curve i, n, which inflection point represents a component tolerance and a wear state of a fuel pump, wherein the fuel pump 12 is provided for a fuel supply system 2 for use in a device equipped with an internal combustion engine. The device can be a passenger vehicle, a utility vehicle, and/or a stationary or mobile generator. Furthermore, a computer program and a computer program product for carrying out the method are proposed, wherein the method is modeled separately by means of software.)

1. A method for determining an inflection point (OP) of a parameter curve (i, n), the inflection point representing a component tolerance and a wear state of a fuel pump (12), wherein the fuel pump is provided for a fuel supply system (2) for use in a device equipped with an internal combustion engine, wherein the method comprises the steps of:

-under defined conditions, at least partially or completely actively shutting off a fuel transfer point (26, 20b) of a feed line of the fuel supply system (2) downstream of the fuel pump (12) in order to at least reduce or even completely prevent fuel flow to the internal combustion engine (28),

incrementally increasing the rotational speed n of the fuel pump motor in order to increase the pressure upstream of the closing point (26, 20b), while determining the phase current i occurring in the fuel pump motor, wherein the rotational speed is increased until the valve (24, 36) of the fuel supply system (2) is Opened (OP) to an opening point in order to reduce the pressure, wherein the determined value of the phase current i is assigned to the individual rotational speed stage, and

-approximating a first set of values (i, n) below the inflection point (OP) by a first straight line, approximating a second set of values (i, n) above the inflection point (OP) by a second straight line, and determining an intersection between the two straight lines, wherein the intersection corresponds to the inflection point (OP) which corresponds to the opening time (OP) of the valve (24, 36), wherein the rotational speed n is such that_OPIs assigned to the intersection.

2. A method as claimed in claim 1, wherein the method is performed during a coasting mode of the internal combustion engine or during a phase in which the internal combustion engine is operated under at least approximately constant conditions.

3. The method as claimed in claim 1 or 2, wherein the rotational speed n is increased until a valve (24, 36) of a low-pressure part (30) of the fuel supply system (2) opens in order to reduce the pressure.

4. A method as claimed in claim 3, wherein the valve (24, 36) of the fuel conduction return line of the low pressure portion (30) is opened to reduce the pressure.

5. The method of one of claims 1 to 4, wherein the method is performed at regular intervals.

6. The method of claim 5, wherein the method is performed after a definable number of hours of operation of the device or after a definable mileage state of the vehicle.

7. The method of claim 6, wherein the method is performed for the first time after a first number of hours of operation of 1 to 3 hours (h) or a first mileage state of 20 to 100km, and thereafter, the method is performed at intervals corresponding to multiples of the first number of hours of operation or mileage state, respectively.

8. The method of claim 6, wherein the method is performed for the first time after a first number of hours of operation of 1 to 3 hours (h) or a first mileage state of 20 to 100km, and thereafter, the method is performed after each refueling process of the fuel tank.

9. Method according to one of claims 1 to 8, wherein the rotational speed n is increased at least substantially in the form of a rotational speed ramp.

10. Method according to one of the preceding claims, wherein the rotation speed n assigned to the inflection point (OP) is stored in a nonvolatile manner for use in a memory on the system side of the control unit (8).

11. A computer program for performing the method of one of claims 1 to 10.

12. A computer program product comprising program code means stored on a computer readable data storage medium for performing the method of one of the preceding claims 1 to 10 when the program code means are executed on a computer.

13. A fuel supply system for use in an apparatus equipped with an internal combustion engine, the fuel supply system comprising:

a low-pressure portion (30) with a fuel pump (12) which is driven by an electric motor and which is intended to deliver fuel from a fuel tank (9),

a shut-off unit (12) for at least partially or completely shutting off a fuel conduction point (26, 20b) in a feed line of a fuel supply system (2) downstream of the fuel pump (12) in order to at least reduce or even completely prevent a flow of fuel to an internal combustion engine (28) under defined conditions, and

at least one control unit (4, 8) in which the method according to one of claims 1 to 10 is modeled by means of software.

14. The fuel supply system as claimed in claim 13, wherein, in addition to the low-pressure portion (30), a high-pressure portion (32) is provided, which is connected in fluid communication to the low-pressure portion (30).

15. The fuel supply system as claimed in claim 14, wherein the fuel supply system (2) comprises a high-pressure pump (20) which connects the low-pressure portion (30) to the high-pressure portion (32) and at the same time forms the closing unit.

16. The fuel supply system as claimed in one of claims 13 to 15, wherein, in addition to the engine control unit (4), a pump control unit (8) is provided which is communicatively connected to the engine control unit (4), in which the method as claimed in one of claims 1 to 10 is modeled by means of software.

17. The fuel supply system as claimed in one of claims 13 to 16, wherein the low-pressure portion (30) is configured in such a way that, in the non-closed state of the fuel conduction point (26, 20b), a fuel pressure of up to approximately 3.5 bar can be achieved in the low-pressure portion (30) by means of the fuel pump (12), and, in the at least partially or fully closed state of the fuel conduction point (26, 20b), a fuel pressure of up to approximately 3.9 bar can be achieved by means of the fuel pump (12), at which pressure the valve (24, 36) opens in order to reduce the pressure.

18. The fuel supply system as claimed in claim 17, wherein the valve (24, 36) is assigned to a fuel conducting return line of the fuel supply system (2).

19. Use of a fuel supply system according to one of claims 13 to 18 in a system operating on gasoline fuel or diesel fuel.

20. An arrangement with a fuel supply system (2) according to one of claims 13 to 18.

21. The apparatus of claim 20, wherein the apparatus is a vehicle or a stationary or mobile generator.